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Quantum confinement and photoresponsivity of ?-In2Se3 nanosheets grown by physical vapour transport

Authors

Nilanthy Balakrishnan

Christopher R. Staddon

Emily F. Smith

Jakub Stec

Dean Gay

Garry W. Mudd

Zakhar D. Kovalyuk



Abstract

We demonstrate that β-In2Se3 layers with thickness ranging from 2.8 – 100 nm can be grown on SiO2/Si, mica and graphite using a physical vapour transport method. The β-In2Se3 layers are chemically stable at room temperature and exhibit a blue-shift of the photoluminescence emission when the layer thickness is reduced, due to strong quantum confinement of carriers by the physical boundaries of the material. The layers are characterized using Raman spectroscopy and X-ray diffraction from which we confirm lattice constants c = 28.31±0.05 Å and a = 3.99±0.02 Å. In addition, these layers show high photoresponsivity of up to ~ 2×103 A/W at λ = 633 nm, with rise and decay times of τr = 0.6 ms and τd = 2.5 ms, respectively, confirming the potential of the as-grown layers for high sensitivity, fast photodetectors.

Citation

Balakrishnan, N., Staddon, C. R., Smith, E. F., Stec, J., Gay, D., Mudd, G. W., …Beton, P. H. (in press). Quantum confinement and photoresponsivity of β-In2Se3 nanosheets grown by physical vapour transport. 2D Materials, 3(2), 1-8. https://doi.org/10.1088/2053-1583/3/2/025030

Journal Article Type Article
Acceptance Date Apr 29, 2016
Online Publication Date Jun 3, 2016
Deposit Date May 21, 2016
Journal 2D Materials
Electronic ISSN 2053-1583
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 3
Issue 2
Article Number 025030
Pages 1-8
DOI https://doi.org/10.1088/2053-1583/3/2/025030
Keywords In2Se3; van der Waals layered crystals; 2D materials; quantum confinement; physical vapour transport
Public URL https://nottingham-repository.worktribe.com/output/783223
Publisher URL http://iopscience.iop.org/article/10.1088/2053-1583/3/2/025030/meta